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Date: Thu, 20 May 2021 17:20:44 +1000
From: Nicholas Piggin <>
To: "Dmitry V. Levin" <>
Cc: Rich Felker <>, Joakim Tjernlund
	<>,,, Michael Ellerman <>,, Segher Boessenkool <>
Subject: Re: Linux powerpc new system call instruction and ABI

Excerpts from Dmitry V. Levin's message of May 20, 2021 12:59 pm:
> On Thu, May 20, 2021 at 12:45:57PM +1000, Nicholas Piggin wrote:
>> Excerpts from Dmitry V. Levin's message of May 20, 2021 11:06 am:
>> > On Wed, May 19, 2021 at 07:48:47PM -0400, Rich Felker wrote:
>> >> On Wed, May 19, 2021 at 06:09:25PM +0000, Joakim Tjernlund wrote:
>> > [...]
>> >> > W.r.t breaking ABI, isn't that what PowerPC is trying to do with the new syscall I/F? 
>> >> 
>> >> No, it's a new independent interface.
>> > 
>> > Unfortunately, being a new independent interface doesn't mean it isn't
>> > an ABI break.  In fact, it was a severe ABI break, and this thread is
>> > an attempt to find a hotfix.
>> It is an ABI break, that was known. The ptrace info stuff I fixed with 
>> the patch earlier was obviously a bug in my initial implementation and 
>> not intended (sorry my ptrace testing was not sufficient, and thanks for
>> reporting it, by the way).
> Could you check whether tools/testing/selftests/ptrace/get_syscall_info.c
> passes again with your fix, please?

It does.


> If yes, then PTRACE_GET_SYSCALL_INFO is fixed.
> By the way, kernel tracing and audit subsystems also use those functions
> from asm/syscall.h and asm/ptrace.h, so your ptrace fix is likely to fix
> these subsystems as well.

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